itunes help needed pls

im having big problems with itunes looking for advice please, have new laptop and all my music was on old one so i put all my music on a usb pen and thought it was just a matter of moving it all over to new itunes but can i do it? no for the life of me i cannot get it to save to itunes, so what am i doing wrong?help please

1- switch on your laptop2- once windows is fully loaded, stick in the usb drive3- window will pop up "open with" select open with windows explorer4- select the files you want to copy and paste on your desktop5- remove usb pen drive6- copy the music files you just copied over on your desktop7- open itunes7- assuming you're using latest version of itunes, find the "music" tab on the left and then go to the top click edit then paste8- thats it you've done